Share-Based Compensation - Additional information (Details) - USD ($)	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-Based Compensation
Non-employee director retainer common shares per quarter			900
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	782,412
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost			$ 180,000
Performance-Accelerated Restricted Share Awards
Share-Based Compensation
Stock options outstanding	0
Vesting period	5 years
Pretax compensation expense	$ 4,300,000	$ 4,000,000.0	3,900,000
Compensation Plan for Non-Employee Directors
Share-Based Compensation
Pretax compensation expense	1,300,000	1,100,000	1,100,000
Total share-based compensation cost	1,200,000
Total income tax benefit recognized		1,100,000	1,300,000
Total unrecognized compensation cost related to share-based compensation arrangements	$ 8,200,000
Remaining weighted-average period for recognition of total unrecognized compensation cost	2 years
Compensation Plan for Non-Employee Directors \| Selling, general and administrative expenses
Share-Based Compensation
Total share-based compensation cost	$ 5,600,000	$ 5,100,000	$ 5,000,000.0

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest quantity of shares an employee can purchase under the plan per period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of options outstanding, including both vested and non-vested options.

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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